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Experimental Investigation of Laminar Flame Speeds for Medium Calorific Gas with Various Amounts of Hydrogen and Carbon Monoxide Content at Gas Turbine Temperatures

In English

Författare

Summary, in English

It is expected that, in the future, gas turbines will be operated on gaseous fuels currently unutilized. The ability to predict the range of feasible fuels, and the extent to which existing turbines must be modified to accommodate these fuels, rests on the nature of these fuels in the combustion environment. Understanding the combustion behavior is aided by investigation of syngases of similar composition. As part of an ongoing project at the Lund University Departments of Thermal Power Engineering and Combustion Physics, to investigate syngases in gas turbine combustion, the laminar flame speed of five syngases (see table) have been measured. The syngases examined are of two groups. The first gas group (A), contains blends of H-2, CO and CH4, with high hydrogen content. The group A gases exhibit a maximum flame speed at an equivalence ratio of approximately 1.4, and a flame speed roughly four times that of methane. The second gas group (B) contains mixtures of CH4 and H-2 diluted with CO2. Group B gases exhibit maximum flame speed at an equivalence ratio of 1, and flame speeds about 3/4 that of methane. A long tube Bunsen-type burner was used and the conical flame was visualized by Schlieren imaging. The flame speeds were measured for a range of equivalence ratios using a constrained cone half-angle method. The equivalence ratio for measurements ranged from stable lean combustion to rich combustion for room temperature (25 degrees C) and an elevated temperature representative of a gas turbine at full load (270 degrees C). The experimental procedure was verified by methane laminar flame speed measurement; and, experimental results were compared against numerical simulations based on GRI 3.0, Hoyerman and San Diego chemical kinetic mechanisms using the DARS v2.02 combustion modeler. On examination, all measured laminar flame speeds at room temperature were higher than values predicted by the aforementioned chemical kinetic mechanisms, with the exception of group A gases, which were lower than predicted.

Publiceringsår

2010

Språk

Engelska

Sidor

173-181

Publikation/Tidskrift/Serie

Proceedings of the ASME Turbo Expo 2010, GT2010-22275

Volym

Volume 2: Combustion, Fuels and Emissions, Parts A and B

Dokumenttyp

Konferensbidrag

Förlag

American Society Of Mechanical Engineers (ASME)

Ämne

  • Energy Engineering
  • Atom and Molecular Physics and Optics

Nyckelord

  • hydrogen
  • syngas
  • laminar flame speed
  • stretch
  • combustion

Conference name

ASME Turbo Expo 2010: Power for Land, Sea, and Air

Conference date

2010-06-14 - 2010-06-18

Conference place

Glasgow, United Kingdom

Status

Published

ISBN/ISSN/Övrigt

  • ISBN: 978-0-7918-4397-0
  • GT2010-22275